HARD
12th West Bengal Board
IMPORTANT
Earn 100

Two identical conducting spheres, having charges of opposite sign attract each other with a force of 0.108 N, when separated by 0.5 m. The spheres are now connected by a conducting wire. When the wire is removed, spheres repel each other with a force of 0.036 N. What were the initial charges on the spheres?

Important Questions on Interaction of Charged Particles, Electric Field and Potential

HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 2 - Interaction of Charged Particles, Electric Field and Potential>EXERCISE 2>Q 20
Two identically charged small metal spheres each of mass 20 gm are suspended from a point by thread of length 1 m. The threads make angle 45° with the vertical. Find the charge on each sphere.
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 2 - Interaction of Charged Particles, Electric Field and Potential>EXERCISE 2>Q 21
Three identical small spheres weighing 0.1gm are suspended from a point with silk threads each having length 20 cm. What charges should be imparted to the spheres so that each thread makes an angle 30° to the vertical? Assume the charges to be equal.
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 2 - Interaction of Charged Particles, Electric Field and Potential>EXERCISE 2>Q 22
A particle of charge e and having mass m travelling along the X -axis with a uniform velocity u enters a uniform electric field E acting perpendicular to the X -axis. If the electric field extends over a length l along the X -axis, what will be the defection of the electron along the direction of the field on emerging from it.
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 2 - Interaction of Charged Particles, Electric Field and Potential>EXERCISE 2>Q 23
The moment of a dipole is 6.8×10-30Cm. If the separation of its two charges is 10-10 m, what is the value of each charge?
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 2 - Interaction of Charged Particles, Electric Field and Potential>EXERCISE 2>Q 24
An electric dipole consists of two equal and opposite charges of magnitude 3nC separated by a distance 2 mm. Find the electric field due to it at a point distant 3 m from its centre lying on line making an angle 60° with its axis.
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 2 - Interaction of Charged Particles, Electric Field and Potential>EXERCISE 2>Q 25
An electron initially at rest, passes through a potential difference of 100 V. Find out the final velocity acquired by the electron. The mass and charge of an electron are respectively 9×10-31 kg and 1.6×10-19C
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 2 - Interaction of Charged Particles, Electric Field and Potential>EXERCISE 2>Q 26
An alpha particle having 1 Mev initial energy is moving directly towards a fixed uranium nucleus. Find the distance of nearest approach between them. Is the acceleration of the alpha particle constant during the time? Given, the atomic number of uranium is 92; charge of an electron e=1.6×10-19C  alpha particle is the helium nucleus and it contains 2 protons and 2 neutrons.
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 2 - Interaction of Charged Particles, Electric Field and Potential>EXERCISE 2>Q 27
Electrons are released in the atmosphere due to collision between air molecules and cosmic ray particles. Such an electron is acted on by an electrostatic force due to electric field of E→of the earth. The electric field of the earth has magnitude E=110 V/m and is directed downward. What is the change in the electric potential energy of a released electron when the electrostatic force moves it vertically upward through a height of h=50 m.